yes you can see a change in ranking because all your previous links are directed to http. You can add a canonical tag so that the links may redirect to your new https URL. Please check you website Sitemap as if there are files which are made of http they also affect your SEO ranking.

yes you can see a change in ranking because all your previous links are directed to http. You can add a canonical tag so that the links may redirect to your new https URL. Please check you website Sitemap as if there are files which are made of http they also affect your SEO ranking.

Yes, this is right you should add canonical tag for redirecting your links to https.

Never worried about http to https, use .htaccess to force every link directly to https. Then update with fresh content 1 or 2 great articles every week or you may simply solve that problem by resubmit your website on google webmaster tools, be sure your sitemap in https